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G. E. Allen (USRA-NASA/GSFC), R. Petre (NASA/GSFC), E. V. Gotthelf (Columbia)
The RXTE high-energy X-ray spectrum of the supernova remnant RCW 86 is presented. This spectrum exhibits a non-thermal high-energy X-ray ``tail.'' The results of a joint analysis of the RXTE, ASCA, and ROSAT data are shown and used to interpret the nature of the emission mechanism that produces the tail. The possible implications of the results for the acceleration of cosmic-ray electrons will be discussed.